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St. Mary's County, Maryland: environmental and disease records

Cancer mortality in St. Mary's County is 164.9 deaths per 100,000 people per year against a U.S. rate of 143.2, a statistically significant excess. The strongest disease signals are Bladder deaths at 1.7 times the U.S. rate and Leukemia deaths at 1.4 times the U.S. rate. Federal databases place 348 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (115), Industrial wastewater discharge (52), Air permit holder (minor source) (44). EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 30 in a million, driven mainly by formaldehyde.

Rates are age-adjusted per 100,000 people. A cancer signal is marked significant when the lower bound of its 95 percent confidence interval is above the U.S. rate. Facility counts use active federal records located inside the county boundary. Approximate county center: 38.2756, -76.5993.

How this county ranks in Maryland

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Cancer deaths and new cases versus the United States

Source: NCI and CDC State Cancer Profiles, both sexes, all ages. Sorted by the ratio of the county rate to the U.S. rate.

Cancer rates for St. Mary's County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Bladder	Deaths	6.9	4.1	1.68xSignificant	5 to 9.4	2020-2024
Leukemia	Deaths	8	5.7	1.4xSignificant	5.8 to 10.7	2020-2024
Kidney & renal pelvis	New cases	24.9	17.9	1.39xSignificant	21.1 to 29.2	2019-2023
Non-Hodgkin lymphoma	Deaths	6.4	4.8	1.33x	4.6 to 8.7	2020-2024
Brain & nervous system	Deaths	5.8	4.4	1.32x	4.1 to 8.1	2020-2024
Esophagus	Deaths	4.7	3.7	1.27x	3.1 to 6.7	2020-2024
Melanoma of the skin	New cases	29.4	23.8	1.24xSignificant	25.1 to 34.1	2019-2023
Stomach	New cases	7.7	6.6	1.17x	5.7 to 10.2	2019-2023
All cancer	Deaths	164.9	143.2	1.15xSignificant	154.9 to 175.4	2020-2024
Stomach	Deaths	3.1	2.7	1.15x	1.9 to 4.8	2020-2024
Pancreas	New cases	15.6	13.9	1.12x	12.6 to 19.1	2019-2023
Leukemia	New cases	16.1	14.5	1.11x	13 to 19.8	2019-2023
Lung & bronchus	Deaths	33.5	30.2	1.11x	29.2 to 38.4	2020-2024
Lung & bronchus	New cases	57.4	51.8	1.11x	51.7 to 63.7	2019-2023
Pancreas	Deaths	12.4	11.3	1.1x	9.8 to 15.5	2020-2024
All cancer	New cases	491.4	453.4	1.08xSignificant	474 to 509.4	2019-2023
Bladder	New cases	19.7	18.7	1.05x	16.4 to 23.6	2019-2023
Non-Hodgkin lymphoma	New cases	19.2	18.5	1.04x	15.9 to 23.1	2019-2023
Childhood cancer (under 15)	New cases	16.9	16.4	1.03x	10.2 to 26.4	2019-2023
Liver & bile duct	New cases	8.9	8.7	1.02x	6.7 to 11.6	2019-2023
Kidney & renal pelvis	Deaths	3.4	3.4	1x	2.1 to 5.2	2020-2024
Thyroid	New cases	11.1	13	0.85x	8.6 to 14.1	2019-2023
Brain & nervous system	New cases	5.2	6.2	0.84x	3.5 to 7.4	2019-2023
Liver & bile duct	Deaths	5.5	6.6	0.83x	3.9 to 7.7	2020-2024
Esophagus	New cases	3.7	4.6	0.8x	2.4 to 5.6	2019-2023

Mortality measures versus the U.S. county median

Source: County Health Rankings, built from CDC National Vital Statistics System death records. The comparison value is the median of all U.S. counties.

Mortality measures for St. Mary's County
Measure	County	U.S. median	Difference	Unit
Premature death	8,104.5	9,842.6	-18%	years of life lost before age 75 per 100,000
Life expectancy	77	75.3	+2%	years
Child mortality	51.2	59.8	-14%	deaths under age 18 per 100,000
Infant mortality	5.7	6.2	-9%	deaths under age 1 per 1,000 live births
Injury deaths	81	96.9	-16%	deaths per 100,000
Drug overdose deaths	35.2	28.6	+23%	deaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 30 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

Formaldehyde18.75 per million
Carbon Tetrachloride2.98 per million
Acetaldehyde1.74 per million
Benzene1.09 per million

EPA Air Quality Index

No EPA air quality monitor reports daily AQI for this county.

Regulated facilities, sites and hazards by type

348 active records inside the county from EPA ECHO, TRI, Superfund, Brownfields, NPDES, EIA, FAA, FRA and corrections data.

NPDES wastewater discharge permit115
Industrial wastewater discharge52
Air permit holder (minor source)44
Gas station (mapped facility)40
Small hazardous waste generator30
Auto repair or body shop (mapped facility)15
Public airport12
Large hazardous waste generator8
Scrapyard (mapped facility)6
Dry cleaner (mapped facility)4
Wastewater plant (mapped facility)4
Commercial airport2
Brownfield property2
Hazardous waste transporter2
Heliport2
Rail grade crossing2
TRI reporting facility2
Toxic chemical release facility (TRI)2
Major air pollution source1
Large greenhouse gas emitter1
Landfill (mapped facility)1
Superfund (NPL) site1

Highest-severity records

The 25 records with the highest Envyrofax severity in the county, with the agency identifier to cite in a records request.

Patuxent River Naval Air Station, St. Mary'S County
Superfund (NPL) site. Hazard Ranking System score 50. NPL Site.
EPA site ID MD7170024536 (U.S. EPA Superfund (SEMS/NPL)) Agency record
Severity 10
Leonardtown Wastewater Treatment Facility, Leonardtown
NPDES wastewater discharge permit.
EPA FRS registry ID 110002055613 (U.S. EPA ECHO) Agency record
Severity 6
Marley-Taylor Wrf, Lexington Park
NPDES wastewater discharge permit.
EPA FRS registry ID 110012818647 (U.S. EPA ECHO) Agency record
Severity 6
Naval Air Station Patuxent River, Patuxent River
TRI reporting facility.
EPA FRS registry ID 110011748118 (U.S. EPA ECHO) Agency record
Severity 5.1
Us Naval Air Station Patuxent River, Patuxent River
Toxic chemical release facility (TRI). Chemicals: Lead. Reports carcinogens. 2 lbs released over 5 years.
TRI facility ID 20670SDDNVNAVAL (U.S. EPA Toxics Release Inventory)
Severity 4.8
Golden Eye Seafood, Piney Point
NPDES wastewater discharge permit. Penalties $2,600.
EPA FRS registry ID 110008483970 (U.S. EPA ECHO) Agency record
Severity 4.8
Naval Air Station Patuxent River, Patuxent River
Major air pollution source.
EPA FRS registry ID 110011748118 (U.S. EPA ECHO) Agency record
Severity 4.5
Smo Mechanicsville Plant, Mechanicsville
Toxic chemical release facility (TRI). Chemicals: 1,2,4-Trimethylbenzene, Naphthalene, Xylene (mixed isomers). Reports carcinogens.
TRI facility ID 2065WSMMCH2823T (U.S. EPA Toxics Release Inventory)
Severity 4.5
Lundeberg Md.Seamanship Sch, Piney Point
NPDES wastewater discharge permit.
EPA FRS registry ID 110012658463 (U.S. EPA ECHO) Agency record
Severity 4.3
Point Lookout Marina, Ridge
NPDES wastewater discharge permit.
EPA FRS registry ID 110012669674 (U.S. EPA ECHO) Agency record
Severity 4.3
Corinthian Yacht Club,Inc., Ridge
NPDES wastewater discharge permit.
EPA FRS registry ID 110012669781 (U.S. EPA ECHO) Agency record
Severity 4.3
Burch'S Pit, Leonardtown
NPDES wastewater discharge permit.
EPA FRS registry ID 110015603408 (U.S. EPA ECHO) Agency record
Severity 4.3
Carruth & Son, Inc. - Lexington Park, Lexington Park
NPDES wastewater discharge permit.
EPA FRS registry ID 110019902532 (U.S. EPA ECHO) Agency record
Severity 4.3
C. A. Bean, Inc., Mechanicsville
NPDES wastewater discharge permit.
EPA FRS registry ID 110037598463 (U.S. EPA ECHO) Agency record
Severity 4.3
Charlotte Hall Metal & Scrap Llc, Charlotte Hall
NPDES wastewater discharge permit.
EPA FRS registry ID 110069485275 (U.S. EPA ECHO) Agency record
Severity 4.3
Hollywood Rmc Facility, Hollywood
NPDES wastewater discharge permit.
EPA FRS registry ID 110070818605 (U.S. EPA ECHO) Agency record
Severity 4.3
Edward Sloan Mine, Mechanicsville
NPDES wastewater discharge permit.
EPA FRS registry ID 110071375853 (U.S. EPA ECHO) Agency record
Severity 4.3
Naval Air Station Patuxent River, Patuxent River
Large hazardous waste generator.
EPA FRS registry ID 110011748118 (U.S. EPA ECHO) Agency record
Severity 4
Naval Air Station Patuxent River, Patuxent River
NPDES wastewater discharge permit.
EPA FRS registry ID 110011748118 (U.S. EPA ECHO) Agency record
Severity 4
Mattingly Mine, Leonardtown
NPDES wastewater discharge permit.
EPA FRS registry ID 110070215880 (U.S. EPA ECHO) Agency record
Severity 4
Chancellor'S Point State Park, St Mary'S City
NPDES wastewater discharge permit.
EPA FRS registry ID 110070383335 (U.S. EPA ECHO) Agency record
Severity 4
Smo Mechanicsville Plant, Mechanicsville
TRI reporting facility.
EPA FRS registry ID 110071071785 (U.S. EPA ECHO) Agency record
Severity 4
Nas Webster Field Annex, Saint Inigoes
Large hazardous waste generator.
EPA FRS registry ID 110001148188 (U.S. EPA ECHO) Agency record
Severity 3.8
Maryland Seafood, Inc., Valley Lee
NPDES wastewater discharge permit.
EPA FRS registry ID 110006633018 (U.S. EPA ECHO) Agency record
Severity 3.8
Charlotte Hall Veterans Home, Charlotte Hall
NPDES wastewater discharge permit.
EPA FRS registry ID 110032595314 (U.S. EPA ECHO) Agency record
Severity 3.8

Correctional facilities

Prisons, jails and corrections operations with an EPA facility record, and the drinking water and wastewater compliance attached to them.

No correctional facility with an EPA record is located in this county.

Discovery / public records

Records to request for St. Mary's County

Maryland state cancer registry
Cancer incidence counts by census tract or ZIP code, by cancer type and year (de-identified). Any cancer cluster inquiries or investigations in St. Mary's County, and their findings.
Maryland vital statistics office
Death certificate counts by cause of death and residence tract or ZIP code, and the years behind the mortality measures above.
Maryland health department, environmental epidemiology
Health consultations or assessments by ATSDR or the state health department covering the county, and any exposure investigations.
Maryland environmental agency and the U.S. EPA regional office
Compliance history, inspection reports, notices of violation, penalties and enforcement actions for each facility above, cited by EPA FRS registry ID.
Maryland drinking water program
Violation notices, sampling results and sanitary surveys for the public water systems serving the county, including any system serving a correctional facility.
Department of corrections or county sheriff
Water testing, grievances and environmental health inspections for the correctional facilities listed above.

Each Envyrofax address report includes a printable records request worksheet with the custodian and the exact request wording per finding.

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